CN112832917A - Anti-stall protection control method for engine of heavy-duty car - Google Patents
Anti-stall protection control method for engine of heavy-duty car Download PDFInfo
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- CN112832917A CN112832917A CN202110176163.5A CN202110176163A CN112832917A CN 112832917 A CN112832917 A CN 112832917A CN 202110176163 A CN202110176163 A CN 202110176163A CN 112832917 A CN112832917 A CN 112832917A
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- automobile
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/22—Safety or indicating devices for abnormal conditions
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D29/00—Controlling engines, such controlling being peculiar to the devices driven thereby, the devices being other than parts or accessories essential to engine operation, e.g. controlling of engines by signals external thereto
- F02D29/02—Controlling engines, such controlling being peculiar to the devices driven thereby, the devices being other than parts or accessories essential to engine operation, e.g. controlling of engines by signals external thereto peculiar to engines driving vehicles; peculiar to engines driving variable pitch propellers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2200/00—Input parameters for engine control
- F02D2200/50—Input parameters for engine control said parameters being related to the vehicle or its components
- F02D2200/501—Vehicle speed
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
Abstract
The invention discloses a heavy-duty car engine stall prevention protection control method, which comprises the following steps: if the rotating speed of the engine of the automobile exceeds the highest idling rotating speed of the engine, judging that the automobile is in a first automobile overspeed state; if the running speed of the automobile exceeds the maximum limit running speed, judging that the automobile is in a second vehicle overspeed state; if the automobile is in the first vehicle overspeed state or the second vehicle overspeed state, judging that the automobile is in the vehicle overspeed state; if the fuel injection quantity of the automobile engine exceeds the fuel injection quantity calibration limit value, judging that the automobile engine is in a running state; if the automobile is in an overspeed state of the automobile and the engine of the automobile is in a running state, judging that the automobile is in an engine stalling condition; and when the automobile is judged to be in the engine stalling condition, immediately triggering the whole automobile braking measure. The method can avoid the inertia sliding of the vehicle caused by the stalling condition of the engine, thereby protecting the engine from being damaged and protecting the personal safety of drivers and passengers.
Description
Technical Field
The invention relates to an automobile engine control method, in particular to a heavy-duty automobile engine stall prevention protection control method.
Background
Compared with the common vehicles, the heavy-duty vehicle has a large volume and large inertia in the driving process, once the vehicle is out of control, the impact force generated by the heavy-duty vehicle on other vehicles or pedestrians is very large, so that serious traffic accidents are often caused, and the damage and loss caused by the impact force are often immeasurable, so that the heavy-duty vehicle is very important to ensure stable and controllable driving.
The engine stall condition is a phenomenon that the mechanical operation process of the engine itself cannot be controlled, and the condition can cause serious destructive influence on the stable and controllable running of the vehicle.
Specifically, when a heavy-duty vehicle travels downhill, if a driver makes a wrong operation to switch from a high gear to a low gear, an engine stall condition of the vehicle engine is easily caused, and then the engine is not controlled, the vehicle may coast, thereby causing serious damage to the engine. Meanwhile, because the automobile engine is positioned below the cab, when the engine is seriously damaged, the conditions of valve mandril breakage, engine cylinder scuffing, cylinder cover burst and the like can occur, and therefore the life safety of drivers and passengers can be threatened.
In the running process of a vehicle, aiming at the stalling condition of an engine, emergency treatment can be carried out only through two ways, namely, manual mechanical braking is used for braking and decelerating, and oil supply to an automobile engine is stopped, specifically, a brake pedal is stepped on and a key is manually closed. However, the above two approaches have long treatment time, poor treatment effect, great risk and poor achieved effect.
In addition, the ECU is an english abbreviation of Electronic Control Unit, wherein the translation is an Electronic Control Unit, and currently, in the automobile industry, the ECU generally refers to a driving Control computer of an automobile, and is an Electronic Control center of the automobile.
Disclosure of Invention
The invention aims to provide a heavy-duty car engine stall prevention protection control method which can avoid vehicle inertia sliding caused by the engine stall condition, thereby protecting an engine from being damaged and protecting the personal safety of drivers and passengers.
In order to achieve the technical purpose, the invention adopts the following technical scheme:
a protection control method for preventing engine stall of a heavy-duty car comprises the following steps:
step 1, comparing the rotating speed of an automobile engine with the highest idling rotating speed of the engine, and if the rotating speed of the automobile engine exceeds the highest idling rotating speed of the engine, judging that the automobile is in a first vehicle overspeed state;
step 2, comparing the running speed of the automobile with the highest limit running speed, and if the running speed of the automobile exceeds the highest limit running speed, judging that the automobile is in a second vehicle overspeed state;
step 3, if the automobile is in a first vehicle overspeed state or a second vehicle overspeed state, judging that the automobile is in a vehicle overspeed state;
step 4, comparing the fuel injection quantity of the automobile engine with the fuel injection quantity calibration limit value, and if the fuel injection quantity of the automobile engine exceeds the fuel injection quantity calibration limit value, judging that the automobile engine is in a running state;
step 5, if the automobile is in an overspeed state and the engine of the automobile is in a running state, judging that the automobile is in an engine stall condition;
and 6, immediately triggering a whole-vehicle braking measure when the automobile is judged to be in the engine stalling condition.
Further, the maximum idling rotation speed of the engine is the sum of the theoretical maximum idling rotation speed of the engine and the deviation value of the maximum idling rotation speed of the engine.
Further, the maximum limit driving speed is the sum of the theoretical maximum limit driving speed and a deviation value of the maximum driving speed.
Further, the full vehicle braking measures include opening exhaust and in-cylinder braking, full EGR valve closing, full throttle opening, and opening VNT booster braking.
Further, the protection control method further includes:
and 7, prompting the engine stalling condition to an automobile driver.
Further, the protection control method further includes:
and 8, when the rotating speed of the engine of the automobile and the running speed of the automobile are both zero, the whole automobile braking measure is quitted.
And further, the fuel injection quantity of the automobile engine is calculated according to the opening of an accelerator pedal and the rotating speed of the engine.
The protection control method of the invention judges the engine stall condition by comparing and analyzing the conditions of the rotating speed of the automobile engine, the automobile running speed and the fuel injection quantity of the automobile engine, and adopts the whole-automobile braking measures aiming at the engine stall condition, thereby effectively avoiding the inertia sliding of the automobile.
Compared with the prior art, the protection control method has the beneficial effects that: the protection control method can accurately judge the engine stall condition, and takes the whole vehicle braking measure to avoid the vehicle from coasting according to the engine stall condition, thereby protecting the engine from being damaged and protecting the personal safety of drivers and passengers.
Drawings
FIG. 1 is a logic control schematic diagram of the anti-stall protection control method for the engine of the heavy-duty car.
Detailed Description
The invention will be further described with reference to the following figures and specific examples:
the embodiment is a protection control method for preventing engine stall of a heavy-duty car, and the method can effectively avoid vehicle inertia sliding caused by the engine stall condition.
In the present embodiment, an electronic control unit ECU is provided in the automobile, and the main execution body of the protection control method is the electronic control unit ECU.
Referring to fig. 1, the protection control method includes steps 1 to 8:
step 1, in an electronic control unit ECU, comparing the rotating speed of an automobile engine with the highest idling rotating speed of the engine, and if the rotating speed of the automobile engine exceeds the highest idling rotating speed of the engine, judging that the automobile is in a first vehicle overspeed state.
In the present embodiment, the engine maximum idle speed is an engine maximum idle speed combined with a maximum deviation, and specifically, the engine maximum idle speed is a sum of an engine theoretical maximum idle speed and an engine maximum idle speed deviation value.
In addition, in the ECU, the comparison process between the engine speed of the automobile and the maximum idling speed of the engine is usually required to be maintained for a certain duration to prevent signal jitter from causing misjudgment.
And 2, comparing the running speed of the automobile with the maximum limit running speed in the electronic control unit ECU, and if the running speed of the automobile exceeds the maximum limit running speed, judging that the automobile is in a second vehicle overspeed state.
In the present embodiment, the maximum limit driving speed is a maximum limit driving speed combined with a maximum deviation, and specifically, the maximum limit driving speed is a sum of a theoretical maximum limit driving speed and a maximum driving speed deviation value.
In addition, in the ECU, the comparison between the vehicle running speed and the maximum limit running speed is usually maintained for a certain duration to prevent the signal jitter from causing misjudgment.
And 3, if the automobile is in the first vehicle overspeed state or the second vehicle overspeed state, judging that the automobile is in the vehicle overspeed state.
And 4, comparing the fuel injection quantity of the automobile engine with the fuel injection quantity calibration limit value in the electronic control unit ECU, and if the fuel injection quantity of the automobile engine exceeds the fuel injection quantity calibration limit value, judging that the automobile engine is in a running state. The ECU is provided with a specific algorithm for calculating the fuel injection quantity of the automobile engine, and the fuel injection quantity of the automobile engine is calculated according to the opening of an accelerator pedal and the rotating speed of the engine by the algorithm.
And 5, if the automobile is in the vehicle overspeed state and the engine of the automobile is in the running state, judging that the automobile is in the engine stall condition.
Specifically, in the electronic control unit ECU, when it is determined that the vehicle is in the vehicle overspeed state, it is represented as a logic signal "1", and similarly, when it is determined that the engine of the vehicle is in the operating state, it is also represented as a logic signal "1", and then the logic signals in both states are logically and-operated, and when the operation result is a logic "1", it is determined that the vehicle is in the engine stall condition, by indicating that both the vehicle overspeed state and the engine operating state are established.
And 6, when the automobile is judged to be in the engine stalling condition, the electronic control unit ECU immediately triggers the whole automobile braking measure. The full vehicle braking measures include opening exhaust and in-cylinder braking, full EGR valve closing, full throttle opening, and opening VNT booster braking.
Specifically, in the electronic control unit ECU, opening exhaust and in-cylinder braking, EGR valve full-closing, throttle full-opening, and opening VNT supercharger braking are triggered by a logic signal "1" of an engine stall condition.
The exhaust brake is characterized in that the exhaust brake is realized by controlling a butterfly valve arranged on an automobile exhaust pipe to block exhaust airflow, so that the exhaust back pressure of an engine is improved, the brake power is increased, and the auxiliary brake function is realized.
The in-cylinder braking means that a compression release type brake is adopted to change the exhaust phase of the engine, and when the compression stroke is about to end, an exhaust valve is opened, so that the work of the air in the compression cylinder of the engine is released to an exhaust system, the energy cannot return to a piston, the braking power of the engine during reverse dragging is increased, and the auxiliary braking effect is achieved.
The EGR valve is fully closed and the throttle valve is fully opened, so that the air quantity participating in combustion can be reduced, the engine can not do work, and the braking purpose is achieved.
The VNT supercharger is opened for braking, namely, the vortex cross section of the VNT supercharger is completely closed, so that the cross section of a nozzle ring is zero, the supercharger cannot increase air inlet pressure, air inlet is reduced, and the braking purpose is achieved.
EGR is an abbreviation of English Exhaust Gas Re-circulation, which is translated in Chinese as an Exhaust Gas recirculation system. The VNT is an abbreviation of variable nozzle turbo in English, which is translated in Chinese under the name of variable-area turbocharger.
And 7, prompting the engine stalling condition to an automobile driver.
Specifically, in the electronic control unit ECU, the prompting process is also triggered by the logic signal "1" of the engine stall condition, the logic signal "1" of the engine stall condition is sent to the vehicle instrument panel, and after the vehicle instrument panel receives the signal, the text alarm information "engine stall, in automatic braking" is displayed on the display, and simultaneously, the sound alarm is given out to remind the automobile driver.
And 8, when the rotating speed of the engine of the automobile and the running speed of the automobile are both zero, the whole automobile braking measure is quitted.
Specifically, when the engine speed and the driving speed of the vehicle are both zero, the current vehicle is considered to be in a safe state, the whole vehicle braking measure can be quitted, and all braking functions on the vehicle are recovered to be normal.
As described above, the main execution body of the protection control method according to the present embodiment is the electronic control unit ECU, but in other embodiments according to the present invention, the main execution body of the method may be other vehicle control computer systems capable of sensing and controlling the vehicle driving state.
In the present embodiment, the automobile engine is a diesel engine.
According to the protection control method, the engine stall condition is judged by comparing and analyzing the conditions of the rotating speed of the automobile engine, the driving speed of the automobile and the fuel injection quantity of the automobile engine, and the whole automobile braking measure is taken according to the engine stall condition, so that the inertia sliding of the automobile is effectively avoided, the engine is protected from being damaged, and the personal safety of drivers and passengers is protected. In addition, because the whole vehicle braking measures in the method comprise the steps of starting exhaust braking and in-cylinder braking, fully closing an EGR valve, fully opening a throttle valve and opening a VNT booster for braking, compared with a brake and a vehicle closing key in a manual braking mode, the electric control braking methods have the advantages of higher response speed and better braking effect, and can more quickly and reliably avoid the vehicle from coasting by matching with the manual braking mode.
The present invention is not limited to the above embodiments, and any modifications, equivalent replacements, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. A protection control method for preventing stall of an engine of a heavy-duty car is characterized by comprising the following steps: the method comprises the following steps:
step 1, comparing the rotating speed of an automobile engine with the highest idling rotating speed of the engine, and if the rotating speed of the automobile engine exceeds the highest idling rotating speed of the engine, judging that the automobile is in a first vehicle overspeed state;
step 2, comparing the running speed of the automobile with the highest limit running speed, and if the running speed of the automobile exceeds the highest limit running speed, judging that the automobile is in a second vehicle overspeed state;
step 3, if the automobile is in a first vehicle overspeed state or a second vehicle overspeed state, judging that the automobile is in a vehicle overspeed state;
step 4, comparing the fuel injection quantity of the automobile engine with the fuel injection quantity calibration limit value, and if the fuel injection quantity of the automobile engine exceeds the fuel injection quantity calibration limit value, judging that the automobile engine is in a running state;
step 5, if the automobile is in an overspeed state and the engine of the automobile is in a running state, judging that the automobile is in an engine stall condition;
and 6, immediately triggering a whole-vehicle braking measure when the automobile is judged to be in the engine stalling condition.
2. The protection control method for preventing engine stall of heavy-duty car according to claim 1, characterized in that: the maximum idling rotation speed of the engine is the sum of the theoretical maximum idling rotation speed of the engine and the deviation value of the maximum idling rotation speed of the engine.
3. The protection control method for preventing engine stall of heavy-duty car according to claim 1, characterized in that: the maximum limit driving speed is the sum of the theoretical maximum limit driving speed and the maximum driving speed deviation value.
4. The heavy-duty car engine stall prevention protection control method according to any one of claims 1 to 3, characterized in that: the full vehicle braking measures include opening exhaust and in-cylinder braking, full EGR valve closing, full throttle opening, and opening VNT booster braking.
5. The protection control method for preventing engine stall of heavy-duty car according to claim 1, characterized in that: the protection control method further includes:
and 7, prompting the engine stalling condition to an automobile driver.
6. The protection control method for preventing engine stall of heavy-duty car according to claim 5, characterized in that: the protection control method further includes:
and 8, when the rotating speed of the engine of the automobile and the running speed of the automobile are both zero, the whole automobile braking measure is quitted.
7. The protection control method for preventing engine stall of heavy-duty car according to claim 1, characterized in that: and the fuel injection quantity of the automobile engine is calculated according to the opening of an accelerator pedal and the rotating speed of the engine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110176163.5A CN112832917B (en) | 2021-02-09 | 2021-02-09 | Anti-stall protection control method for heavy-duty car engine |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110176163.5A CN112832917B (en) | 2021-02-09 | 2021-02-09 | Anti-stall protection control method for heavy-duty car engine |
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| CN112832917A true CN112832917A (en) | 2021-05-25 |
| CN112832917B CN112832917B (en) | 2022-09-30 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009190597A (en) * | 2008-02-15 | 2009-08-27 | Kanto Auto Works Ltd | Vehicle control apparatus |
| JP2011131654A (en) * | 2009-12-22 | 2011-07-07 | Mitsubishi Fuso Truck & Bus Corp | Vehicle speed limiting device |
| CN202007708U (en) * | 2011-02-01 | 2011-10-12 | 潍柴动力股份有限公司 | Runaway protection equipment and system for diesel engine |
| CN107989707A (en) * | 2017-12-05 | 2018-05-04 | 安徽华菱汽车有限公司 | Heavy-duty vehicle and its ECU, racing of the engine suppression system and suppressing method |
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2021
- 2021-02-09 CN CN202110176163.5A patent/CN112832917B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009190597A (en) * | 2008-02-15 | 2009-08-27 | Kanto Auto Works Ltd | Vehicle control apparatus |
| JP2011131654A (en) * | 2009-12-22 | 2011-07-07 | Mitsubishi Fuso Truck & Bus Corp | Vehicle speed limiting device |
| CN202007708U (en) * | 2011-02-01 | 2011-10-12 | 潍柴动力股份有限公司 | Runaway protection equipment and system for diesel engine |
| CN107989707A (en) * | 2017-12-05 | 2018-05-04 | 安徽华菱汽车有限公司 | Heavy-duty vehicle and its ECU, racing of the engine suppression system and suppressing method |
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| CN112832917B (en) | 2022-09-30 |
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Address after: 2636 Jungong Road, Yangpu District, Shanghai 200438 Applicant after: Shanghai New Power Automotive Technology Co.,Ltd. Address before: 2636 Jungong Road, Yangpu District, Shanghai 200438 Applicant before: SHANGHAI DIESEL ENGINE Co.,Ltd. |
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